【正确答案】 C

【答案解析】[注释] 词义型结构搭配。refer to．．．as把……称作……；confine...to把……局限于；管制；attach...to缚上，系上，贴上，使……依附于，使……依恋；add to(＝increase)增加。注意：1)attach importance/significance to重视，例如：They attached great importance to his speech．2)信件用语：Attached to this letter，you will find...随信附上…